RegExp type of JavaScript reference type (regular expression)

The ECMAScript uses RegExp to support regular expressions. Using the following Perl-like syntax, you can create a regular expression.

var  Expression=/pattern/flags;

As above code:

The pattern---pattern section can be any simple or complex regular expression that can contain character classes, qualifiers, groupings, forward lookups, and reverse references.

Falgs---each regular expression can have one or more flags (flags) that indicate the behavior of the regular expression;

The following are the 3 flags supported by the matching pattern of the regular expression:

G: Represents the global pattern, which means that the pattern will be applied to all strings, rather than stopping immediately when the first occurrence is found;

I: Indicates case-insensitive mode, that is, the case of the pattern and the string are ignored when the match is determined;

M: represents multiline mode, that is, when you reach the end of a line of text, you also continue to find out if the next row has an item that matches the pattern

RegExp type of JavaScript reference type (regular expression)